The objective and the eyepiece of a refracting astronomical telescope have focal lengths of 320 cm and 4.0 cm, respectively
The telescope is used to view Neptune and the final image is set at infinity. The diameter of Neptune is 4.96 × 107 m, and its distance from Earth at the time of observation is 4.4 × 1012 m. What is the angle (in milliradians) subtended by the final telescopic image of Neptune?
A) 0.90 mrad
B) 1.1 mrad
C) 1.3 mrad
D) 1.5 mrad
E) 1.7 mrad
A
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The main reason for use of stainless steel is resistance to _________.
Fill in the blank(s) with the appropriate word(s).
Charge of uniform density 4.0 nC/m is distributed along the x axis from x = ?2.0 m to x = +3.0 m. What is the magnitude of the electric field at the point x = +5.0 m on the x axis?
A. 16 N/C B. 13 N/C C. 19 N/C D. 26 N/C E. 5.0 N/C
Which of the following statements comparing halo stars to our Sun is not true?
A) Most stars in the halo have either died or are in their final stages of life, while the Sun is only in about the middle of its lifetime. B) Most stars in the halo are less luminous than the Sun. C) Most stars in the halo have cooler surface temperatures than the Sun. D) Most stars in the halo contain a much lower percentage of heavy elements than the Sun.
The solar constant is a measure of
a. the amount of solar energy reaching Earth. b. the length of the sunspot cycle. c. the period of rotation of the Sun's equator. d. the average number of sunspots seen during the Maunder minimum. e. the Sun's mass.